177 lines
4.6 KiB
C++
177 lines
4.6 KiB
C++
/* ionebula3.c -- IO base function header for compress/uncompress .zip
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files using zlib + zip or unzip API
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ZLib File IO functions for Nebula3
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(C) 2007 Radon Labs GmbH
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*/
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#include "stdneb.h"
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#include "io/filestream.h"
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#include "zlib.h"
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#include "ioapi.h"
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#include "ionebula3.h"
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voidpf ZCALLBACK nebula3_open_file_func OF((
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voidpf opaque,
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const char* filename,
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int mode));
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uLong ZCALLBACK nebula3_read_file_func OF((
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voidpf opaque,
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voidpf stream,
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void* buf,
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uLong size));
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uLong ZCALLBACK nebula3_write_file_func OF((
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voidpf opaque,
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voidpf stream,
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const void* buf,
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uLong size));
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long ZCALLBACK nebula3_tell_file_func OF((
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voidpf opaque,
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voidpf stream));
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long ZCALLBACK nebula3_seek_file_func OF((
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voidpf opaque,
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voidpf stream,
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uLong offset,
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int origin));
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int ZCALLBACK nebula3_close_file_func OF((
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voidpf opaque,
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voidpf stream));
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int ZCALLBACK nebula3_error_file_func OF((
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voidpf opaque,
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voidpf stream));
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//------------------------------------------------------------------------------
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/**
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*/
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voidpf ZCALLBACK nebula3_open_file_func (voidpf opaque, const char* filename, int mode)
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{
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n_assert(mode == (ZLIB_FILEFUNC_MODE_READ | ZLIB_FILEFUNC_MODE_EXISTING));
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GPtr<IO::FileStream> fileStream = IO::FileStream::Create();
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fileStream->SetAccessMode(IO::Stream::ReadAccess);
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fileStream->SetURI(filename);
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if (fileStream->Open())
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{
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fileStream->AddRef();
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return fileStream.get();
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}
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else
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{
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return 0;
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}
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}
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//------------------------------------------------------------------------------
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/**
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*/
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uLong ZCALLBACK nebula3_read_file_func (voidpf opaque, voidpf stream, void* buf, uLong size)
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{
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uLong ret = 0;
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if (NULL != stream)
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{
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IO::FileStream* fileStream = (IO::FileStream*) stream;
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ret = fileStream->Read(buf, size);
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}
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return ret;
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}
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//------------------------------------------------------------------------------
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/**
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*/
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uLong ZCALLBACK nebula3_write_file_func (voidpf opaque, voidpf stream, const void* buf, uLong size)
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{
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n_error("nebula3_write_file_func(): Writing to ZIP archives not supported!");
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return -1;
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}
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//------------------------------------------------------------------------------
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/**
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*/
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long ZCALLBACK nebula3_tell_file_func (voidpf opaque, voidpf stream)
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{
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long ret = -1;
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if (NULL != stream)
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{
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IO::FileStream* fileStream = (IO::FileStream*) stream;
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ret = fileStream->GetPosition();
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}
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return ret;
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}
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//------------------------------------------------------------------------------
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/**
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*/
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long ZCALLBACK nebula3_seek_file_func (voidpf opaque, voidpf stream, uLong offset, int origin)
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{
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long ret = -1;
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if (NULL != stream)
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{
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IO::FileStream* fileStream = (IO::FileStream*) stream;
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IO::Stream::SeekOrigin neb3Origin;
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switch (origin)
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{
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case ZLIB_FILEFUNC_SEEK_CUR:
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neb3Origin = IO::Stream::Current;
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break;
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case ZLIB_FILEFUNC_SEEK_END:
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neb3Origin = IO::Stream::End;
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break;
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case ZLIB_FILEFUNC_SEEK_SET:
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neb3Origin = IO::Stream::Begin;
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break;
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default:
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return -1;
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}
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// FIXME: hmm... should we return -1 if going past the valid file area??
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fileStream->Seek(offset, neb3Origin);
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ret = 0;
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}
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return ret;
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}
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//------------------------------------------------------------------------------
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/**
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*/
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int ZCALLBACK nebula3_close_file_func (voidpf opaque, voidpf stream)
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{
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int ret = -1;
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if (NULL != stream)
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{
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IO::FileStream* fileStream = (IO::FileStream*) stream;
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fileStream->Close();
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fileStream->Release();
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fileStream = 0;
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ret = 0;
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}
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return ret;
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}
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//------------------------------------------------------------------------------
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/**
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*/
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int ZCALLBACK nebula3_error_file_func (voidpf opaque, voidpf stream)
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{
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return 0;
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}
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//------------------------------------------------------------------------------
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/**
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*/
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void fill_nebula3_filefunc (zlib_filefunc_def* pzlib_filefunc_def)
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{
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pzlib_filefunc_def->zopen_file = nebula3_open_file_func;
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pzlib_filefunc_def->zread_file = nebula3_read_file_func;
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pzlib_filefunc_def->zwrite_file = nebula3_write_file_func;
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pzlib_filefunc_def->ztell_file = nebula3_tell_file_func;
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pzlib_filefunc_def->zseek_file = nebula3_seek_file_func;
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pzlib_filefunc_def->zclose_file = nebula3_close_file_func;
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pzlib_filefunc_def->zerror_file = nebula3_error_file_func;
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pzlib_filefunc_def->opaque=NULL;
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}
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